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303
304
303 Secondary deposits of coarse calcite crystals
(pink) lining cracks and air voids within 17th century
lime mortar; XPT, ×150.
304 Cracks filled with gypsum (grey) within lime
mortar containing sulfate-rich furnace clinker
aggregate (black). Lime mortar from a mine building;
XPT, ×75.
305
306
305 Red discolouration of chalk aggregate particle
(left) within fire-damaged lime mortar; PPT, ×150.
306 Three layers of limewash coating lime render, as
seen 5 years after application. Note the variation in
limewash thickness; XPT, ×150.
307
308
307 Decorated Roman wall plaster from
archaeological excavations at Verulamium in
southeast England (Ingham, 2004), showing three
limewash coats with the outer including a yellow
pigment (probably ochre); PPT, ×300.
308 19th century lime render from a lighthouse.
Impermeable modern paint coating (black) over
historic lime render. Salts have become trapped
behind the paint (white); PPT, ×35.
 
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